The singer admitted while she has worn fur in the past, it was a "selfish phase" and she is happy to strip off to show off her body - and collection of tattoos - in support of the animal welfare organisation.

She said: "I would like to say I've always been fur-free. Unfortunately, I went through a selfish phase and wore fur on a couple of occasions.

(Photo: Getty)

"But I wised up and now boycott fur completely. I wish everyone was forced to learn the horrors that these animals go through for fashion trends.

"I hope fur-wearers get bitten in the ass by the same kind of animal they wear on their back."

Pink is baring all for the organisation's 'Rather Go Naked Than Wear Fur' campaign, with a billboard being unveiled at Times Square on Wednesday night ahead of New York Fashion Week, which kicks off tomorrow.

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The series - which has also been supported by Eva Mendes, Alexandra Burke and Lucy Watson - hopes to raise awareness of animal cruelty, with many caged, beaten, electrocuted and skinned for wool, leather, skins and fur.

The snaps were taken by Ruven Afanador, and Pink has previously supported PETA when she teamed with Ricky Gervais as they lent their voice to an edgy CGI video targeting animal skins.

Pamela Anderson appeared in a video for the organisation last year, when she performed a burlesque routine to encourage people to keep their dogs inside during the winter.